Methods and compounds for making coatings, waveguides and other optical devices

ABSTRACT

A compound of the general formula R 1 MR 4 R 5 R 6  is provided where R 1  is a partially or fully fluorinated aryl, alkyl, alkenyl or alkynyl group, wherein M is selected from group 14 of the periodic table, wherein R 4 , R 5  and R 6  are independently an alkoxy group OR 3  or a halogen group X—except, a) where R 4 , R 5  and R 6  are each ethoxy, M is Si and R 1  is perfluorinated phenyl or perfluorinated vinyl; b) where R 4  is ethoxy, R 5  and R 6  are chlorine, M is Si, and R 1  is perfluorinated phenyl; or c) where R 4 , R 5  and R 6  are chlorine, M is Si, and R 1  is perfluorinated phenyl, perfluorinated methyl or perfluorinated vinyl. This compound formed can be further reacted to attach an additional organic R group, and/or hydrolyzed, alone or with one or more similar compounds, to form a material having a molecular weight of from 500 to 10,000, which material can be deposited on various substrates as a coating or deposited and patterned for a waveguide or other optical device components. Methods for making compounds of the general formula R 1 MR 4 R 5 R 6  are also disclosed.

BACKGROUND OF THE INVENTION

Growing internet and data communications are resulting in the need for greater numbers and types of optical components within expanding optical networks. DWDM systems, or any system that utilizes light to transmit information, utilize a variety of components for creating, transmitting, manipulating and detecting light. Such optical device components, also referred to as optoelectronic or photonic components, often comprises at least a portion that is transmissive to light at particular wavelengths. Fibers and planar light guides are examples of passive light transmissive optical components within an optical network. However, light manipulators (components that modify, filter, amplify, etc. light within the optical network) also often have portions that are transmissive to light, as often do photodetectors and light emittors.

Regardless of the type of optical device component, it is usually desirable that a material is used that is highly transmissive to the wavelengths used to transmit information through the optical network. In addition to low optical absorbance, the material should preferably have low polarization dependent loss and have low birefringence and anisotropy, and low stress. It is also desirable that the material be easy to deposit or form, preferably at a high deposition rate and at a relatively low temperature. Once deposited or formed, it is desirable that the material can be easily patterned, preferably directly patterned without the need for photoresist and etching steps, and preferably patterned with small feature sizes if needed. Once patterned, the material should preferably have low surface and/or sidewall roughness. The material should also preferably be hydrophobic to avoid uptake of moisture once installed and in use, and be stable with a relatively high glass transition temperature (not degrade or otherwise physically andlor chemically change upon further processing or when in use).

Often, current materials used for making optical device components have some, but not all, of these characteristics. For example, inorganic materials such as silica are relatively stable, have relatively high glass transition temperatures have relatively low optical loss. However, silica materials often require higher deposition temperatures. (limiting substrates and components on the substrates) and have lower deposition rates and cannot be directly patterned. Organic materials such as polymers can be deposited at lower temperatures and at higher deposition rates, but are relatively unstable and have lower glass transition temperatures. What are needed are materials for optical device components that have a larger number of the preferred characteristics set forth above.

SUMMARY OF THE INVENTION

A compound of the general formula R¹MR⁴R⁵R⁶ is provided where R¹ is a partially or fully fluorinated aryl, alkyl, alkenyl or alkynyl group, wherein M is selected from group 14 of the periodic table, wherein R⁴, R⁵ and R⁶ are independently an alkoxy group OR³ or a halogen group X—except, a) where R⁴, R⁵ and R⁶ are each ethoxy, M is Si and R¹ is perfluorinated phenyl or perfluorinated vinyl; b) where R⁴ is ethoxy, R⁵ and R⁶ are chlorine, M is Si, and R¹ is perfluorinated phenyl; or c) where R⁴, R⁵ and R⁶ are chlorine, M is Si, and R¹ is perfluorinated phenyl, perfluorinated methyl or perfluorinated vinyl. This compound formed can be further reacted to attach an additional organic R group, and/or hydrolyzed, alone or with one or more similar compounds, to form a material having a molecular weight of from 500 to 10,000, which material can be deposited on various substrates as a coating or deposited and patterned for a waveguide or other optical device components.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Compounds

In the present invention, compounds are made that can be hydrolyzed and condensed (alone or with one or more other compounds) into a material having a molecular weight of from 500 to 10,000 (preferably from 1,000 to 3,000), which material can be deposited by spin-on, spray coating, dip coating, or the like. Such compounds are preferably partially or fully fluorinated, though not necessarily so in all embodiments. The compounds will preferably have an element M selected from groups 3-6 or 13-16 of the periodic table, which element is preferably tri-, tetra- or penta-valent, and more preferably tetravalent, such as those elements selected from group 14 of the periodic table. Connected to this element M are from three to five substituents, wherein from one to three of these substituents are organic groups to be discussed further below, with the remainder being a halogen or an alkoxy group.

COMPOUND EXAMPLE I

In one embodiment of the invention, a compound is provided of the general formula: R¹MOR³ ₃, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group), where M is an element selected from column 14 of the periodic table, and where OR³ is an alkoxy group—except where M is Si, R¹ is perfluorinated phenyl or perfluorinated vinyl, and OR³ is ethoxy, which, though not novel per se, can be part of one of the novel methods of the invention as will be discussed further below. R¹ can have an inorganic component, though if so, a portion should preferably be a partially or fully fluorinated organic component. In a more preferred example of this embodiment, R¹ comprises a double bond that is capable of physical alteration or degradation in the presence of an electron beam, or electromagnetic radiation and a photoinitiator (or sensitizer, photoacid or thermal initiator—to be discussed further below). In this example, R¹ could be an alkenyl group such as a vinyl group, or could be an epoxy or acrylate group, that is preferably partially or fully fluorinated. Such a group, as will be discussed further herein, can allow for crosslinking upon application of an electron beam or preferably electromagnetic radiation (e.g. directing ultraviolet light through a mask with the material comprising a photoinitiator). In the alternative, R¹ could be an organic group that is (or a hybrid organic-inorganic group that comprises) a single or multi ring structure (an “aryl group”) or an alkyl group of any length, such as from 1 to 14 carbon atoms or longer (preferably 4-10)—the alkyl group capable of being a straight or branched chain. If R¹ is a ring structure, or a carbon chain of sufficient length (e.g. 4 (or 5) or more carbons), then such an R¹ group can provide bulk to the final material once hydrolyzed, condensed and deposited on a substrate. If R¹ is a ring structure, whether single ring or multi ring, it can have substituents thereon, fluorinated, though not necessarily, such as alkyl or alkenyl substituents (preferably from 1 to 5 carbons), and where the substituents on the ring structure can be at from 1 to 3 locations around the ring. R¹ can be a 4 to 8 sided ring structure (preferably 5 or 6 sided) which ring structure could comprise N or O. R¹ could comprise nitrogen, or R¹ can also have an oxygen component, such as a carboxylate group (e.g. acrylate, butenecarboxylate, propenecarboxylate, etc.).

In the example above, in R¹ MOR³ ₃, M can be a tetravalent element from column 14 of the periodic table (e.g. Si or Ge), or a tetravalent element from column 16—e.g. Se (or a tetravalent early transition metal—such as titanium or zirconium). Also, OR³ is an alkoxy group, though preferably one having from 1 to 4 carbon atoms (longer alkoxy groups can be used, but are more expensive). Specific examples include:

Acryltriethoxysilane Pentafluorophenyltriethoxygernane

Chlorodifluoroacetic acid, triethoxy Perfluoro-3-butene acid, triethoxysilyl silyl ester ester

Heptafluorotoluenetrietioxysilane 4-triethoxysilyl perfluorostyrene

Tetrafluoroethyltrifluorovinyl ether triethoxysilane Perfluorobutanetriethoxysilane

Perfluoro-t-butyl triethoxysilane Perfluorooctyltriethoxysilane

Perfluorohexanetriethoxysilane 2-trifluoromethyl-2-triethoxysilyl perfluoro pentane

COMPOUND EXAMPLE II

In yet another embodiment of the invention, a compound is provided of the general formula: R¹MOR³ ₂X, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above, where M is an element selected from group 14 of the periodic table as mentioned above, where X is a halogen, and where OR³is an alkoxy group as above. X in this example is preferably F, Cl, Br or I, and more preferably Cl or Br. Specific examples of compounds within this category include

COMPOUND EXAMPLE III

In another embodiment of the invention, a compound is provided of the general formula: R¹MX₂OR³, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above, where M is an element selected from group 14 of the periodic table as mentioned above, where OR³ is an alkoxy group as above, and where X is a halogen as above—Except where M is Si, R¹ is perfluorinated phenyl, X is Cl, and OR³ is ethoxy, which, though not novel per se, is novel when used as part of the methods of the invention as will be discussed further below. Specific examples within this category include

COMPOUND EXAMPLE IV

In a further embodiment of the invention, a compound is provided of the general formula: R¹MX₃, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above, where M is an element selected from group 14 of the periodic table as mentioned above, and where X is a halogen as above—Except where M is Si, R¹ is perfluorinated phenyl, perfluorinated methyl or perfluorinated vinyl, and X is Cl, which, though not novel per se, are novel when used as part of the methods of the invention as will be discussed further below. (If M is Si and X is Cl, some of these novel trichlorosilanes could be used for forming self assembled monolayers for making a surface hydrophobic, preferably by application in the vapor phase to a surface made of silicon and having OH end groups and moisture.) Specific examples within this category include

COMPOUND EXAMPLE V

In yet another embodiment of the invention, a compound is provided of the general formula: R¹R²MOR³ ₂, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, R² is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, or any such organic groups nonfluorinated, and where R¹ and R² are the same or different from each other, where M is an element selected from group 14 of the periodic table as mentioned above, and where OR³ is an alkoxy group as above—except where M is Si, OR³ is ethoxy and R¹ and R² are perfluorinated phenyl groups, which compound is not novel per se, but is novel when used as part of the methods of the invention as set forth below. Specific examples within this category include:

Pentafluorophenyltrifluorovinyldiethoxy- Methylpentafluorophenyldimethoxy-silane silane

Pentafluorophenyltrifluoromethyl Perfluorotoluenetn fluorovinyldlet hoxy-diethoxysilane silane

Di(perfluorotoluene)diethoxysilane Perfluorostyreneperfluorotoluenediethoxy-silane

Pentafluorophenylperfluorostyryt- Bis(perfluorohexane)diethoxysilane diethioxysilane

Perfluorooctyltrifluorovinyldiethoxysilane Bis(trifluorovinyl)diethoxysilane

Perfluoro(t-butyl)trifluorovinyldlethoxysilane

COMPOUND EXAMPLE VI

In another embodiment of the invention, a compound is provided of the general formula: R¹R²MXOR³, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, R² is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, or any such organic groups nonfluorinated, and where R¹ and R² are the same or different from each other, where M is an element selected from group 14 of the periodic table as mentioned above, where OR³ is an alkoxy group as above, and where X is a halogen. R¹ and R² can be the same or different from each other. Specific examples within this category include:

COMPOUND EXAMPLE VII

In a further embodiment of the invention, a compound is provided of the general formula: R¹R²MX₂, where R¹ is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, R² is any partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹, or any such organic groups nonfluorinated, and where R¹ and R² are the same or different from each other, where M is an element selected from group 14 of the periodic table as mentioned above, and where X is a halogen as above—Except where M is Si, R¹ and R² are perfluorinated phenyl, and X is Cl, which, though not novel per se, is novel when used as part of the methods of the invention as will be discussed further below. Specific examples within this category include:

As Compounds V-VII have two organic groups, they can be formed by various combinations of Methods A, B and/or C (described in further detail below).

COMPOUND VIII

In a further embodiment of the invention, a compound is provided of the general formula: R¹R²R³MOR³, where R¹, R² and R³ are independently an aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹ and R², and where R¹, R² and R³ can each be the same or different from each other (and preferably at least one of where R¹, R² and R³ is partially or fully fluorinated), where M is preferably an element selected from group 14 of the periodic table as above, and where OR³ is an alkoxy group as above. One example is

though the organic groups need not each be the same as in this example, and need not each be fluorinated (though preferably at least one of the organic groups is fluorinated).

COMPOUND IX

In another embodiment of the invention, a compound is provided of the general formula: R¹R²R³MX, where R¹, R² and R³ are independently an aryl, alkenyl, alkynyl or alkyl group) as set forth above with respect to R¹ and R², and where R¹, R² and R³ can each be the same or different from each other (and preferably at least one of where R¹, R² and R³ is partially or fully fluorinated), where M is preferably an element selected from group 14 of the periodic table as above, and where X is a halogen as above. One example is:

As Compounds VIII and IX have three organic groups, they can be formed by various combinations of Methods A, B and/or C (which methods are described in further detail below).

OTHER COMPOUNDS

Additional compounds within the scope of the invention include those having the general formula R¹MHX₂ where R¹, M and X are as above and H is hydrogen. One example is:

Other examples, where the fluorinated phenyl group is replaced with a substituted phenyl, fluorinated alkyl, vinyl, etc. are possible.

It should be noted that M in the compound formula examples above need not be tetravalent. M can also have other valencies, though preferably tri- or penta-valent. Examples would include early transition metals in group 3 or 5 of the periodic table (e.g. Y, V or Ta), or elements in columns 13 (column headed by B) or 15 (column headed by N), such as B, Al or As. In such situations, the compounds above would have one fewer or one additional alkoxy (OR³), halogen (X) or an orgailc group (R¹ or R² independently from the other organic group(s)). Examples include R¹MOR³X, R¹MOR³ ₂, R¹MX₂, R¹R²MX, R¹R²MOR³, where M is a trivalent early transition metal (or similar examples with five substituents selected from R¹ and/or R² groups, as well as alkoxy and halogen groups for pentavalent elements (including metalloids or transition metals). Such compounds could have the formula R1_(3-m)MOR3_(m), R1_(5-m)MOR3_(m), R2R1_(4-m)MOR3_(m) or R2R1_(4-m)MOR3_(m). If such tri- or penta-valent elements are used, such a compound would preferably be hydrolyzed and condensed as a dopant, rather than as the main portion of the material at the time of hydrolysis and condensation (likewise with non-silicon tetravalent elements that form compounds in accordance with the tetravalent examples above, such as germanium compounds).

It should also be noted that the structures illustrated above are exemplary only, as other ring structures (3 sided—e.g. epoxy, or 4 to 8 sided—preferably 5 or 6 sided) are possible, which structures can include nitrogen or oxygen in or bound the ring. The aryl group can have from 1 to 3 substitutents, such as one or more methyl, ethyl, ally, vinyl or other substituents—that can be fluorinated or not. Also, carbon chain R groups can include oxygen (e.g. carboxylate) or nitrogen, or sulpher. If an alkyl group is bound to the silicon (or other M group), it can have from 1 to 4 carbons (e.g. a C2+ straight or C3+ branched chain), or up to 14 carbons (or more)—if used as a bulk enhancing group for later hydrolysis and deposition, 4 or more carbons are preferable. These aryl groups can be fully or partially fluorinated, as can alkenyl or alkynyl groups if used.

Methods of Making the Compounds for Later Hydrolysis and Condensation

In a number of the following examples of methods within the scope of the present invention, “M” is silicon, OR³ is ethoxy, and X is Cl. However, as noted above, other alkoxy groups could easily be used (methoxy, propoxy, etc.), and other group 3-5 or 13-16 elements could be used in place of silicon and other halogens in place of chlorine. Starting materials can vary from tetraethoxy silane, to ethoxy silanes having one or more organic groups bound to the silicon, to chorosilanes having one or more chlorine groups and/or one or more organic groups, as well as starting materials having chlorine and alkoxy groups and with one or more organic groups. Any compound examples within Compounds I-IX above could be used as starting materials—or could be intermediate or final compounds as will be seen below. For example, trifluorovinyltriethoxysilane could be a final compound resulting from reacting a particular trifluorovinyl compound with tetraethoxysilane, or trifluorovinylsilane could be a starting material that, when reacted with a particular pentafluorophenyl compound, results in pentafluorophenyltrifluorovinyldiethoxysilane. As mentioned above, it is also preferred that any organic groups that are part of the starting material or are “added” by chemical reaction to become part of the compound as set forth below, are partially or fully fluorinated (or fully or partially deuterated), though such is not necessary as will also be seen below.

One example of a method of the present invention comprises providing a compound R¹ _(4-q)MOR³ _(q) where M is selected from group 14 of the periodic table, OR³ is an alkoxy group, R¹ is an alkyl, allcenyl, aryl or alkynyl, and q is from 2 to 4; reacting the compound R¹ _(4-q)MOR³ _(q) with either a) Mg and R²X² where X² is Cl, Br or I and R² is an alkyl, alkenyl, aryl or alkynyl group, or b) reacting with R²X¹ where R² is an alkyl, alkenyl, aryl or alkyl group and wherein R² is fully or partially fluorinated or deuterated and X¹ is an element from group 1 of the periodic table; so as to replace one of the OR³ groups in R¹ _(4-q)MOR³ _(q) so as to form R¹ _(4-q)R²MOR³ _(q-1).

The starting material preferably has 1 or 2 (or no) organic groups (R¹) bound to the group 14 element “M”, which organic groups may or may not comprise fluorine, with the remaining groups bound to M being alkoxy groups. An additional preferably fluorinated (partially of fully) organic group becomes bound to the group 14 element by one of a number of reactions. One method (Method A) involves reacting the starting material with magnesium and a compound having the desired organic group (R²) bound to a halogen X² (preferably Cl, Br or I)—namely R² X², which reaction replaces one of the alkoxy groups with the organic group R². In the above example, a single alkoxy group is replaced, however, depending upon the molar ratios of starting material to R²X² and Mg, more than one alkoxy group can be replaced with an R² organic group. In one example of the above, a tetraethoxysilane, MOR³ ₄ is reacted with a compound R²X² where R² is a preferably fluorinated alkyl aryl, alkenyl or alkynyl group and X² is preferably Br or I, so as to form R²MOR³ ₃. In another example, R¹MOR³ ₃ is reacted with R²X² so as to form R¹R²MOR³ ₂. This group of reactions can be referred to as: reacting the starting material R¹ _(4-q)MOR³ _(q) with R²X² where R² is a preferably fluorinated alkyl, aryl, alkenyl or alkynyl group and X² is preferably Br or I, so as to form R¹ _(4-q) R²MOR³ _(q-1).

This method A can be described as a method comprising reacting a compound of the general formula R¹ _(4-m)MOR³ _(m), wherein m is an integer from 2 to 4, OR³ is an alkoxy, and M is an element selected from group 14 of the periodic table; with a compound of the general formula R²X²+Mg, wherein X² is Br or I, where R¹ and R² are independently selected from alkyl, alkenyl, aryl or alkynyl, and wherein at least one of R¹ and R² is partially or fully fluorinated, so as to make a compound of the general formula R²MR¹ _(3-n)OR³ _(n), wherein n is an integer from 1 to 3.

An alternate to the above method (Method B) is to react the same starting materials (R¹ _(4-q) MOR³ _(q)) with a compound R²X¹ where, as above, R² is an alkyl, alkenyl, aryl or alkynyl group and wherein R² is fully or partially fluorinated or deuterated and X¹ is an element from group 1 of the periodic table; so as to replace an OR³ group in R¹ _(4-q) MOR³ _(q) to form R¹ _(4-q) R²MOR³ _(q-1). In this example, X¹ is an element from group 1 of the periodic table, and is preferably Na, Li or K (more preferably Na or Li). In one example of the above, a tetraethoxysilane, MOR³ ₄ is reacted with a compound R²X¹ where R² is a preferably fluorinated alkyl, aryl, alkenyl or alkynyl group and X¹ is preferably an element from group I of the periodic table, so as to form R²MOR³ ₃. In another example,. R¹MOR³ ₃ is reacted with R²X¹ so as to form R¹R²MOR³ ₂.

This method B can be described as a method comprising reacting a compound of the general formula R1_(4-m)MOR3_(m) wherein m is an integer from 2 to 4, R1 is selected from alkyl, alkenyl, aryl, or alkyl, alkenyl or aryl, and wherein R1 is nonfluorinated, or fully or partially fluorinated, OR3 is alkoxy, and M is an element selected from group 14 of the periodic table; with a compound of the general formula R2M1, wherein R2 is selected from alkyl, alkenyl, aryl, alkynyl, and wherein R2 is at least partially fluorinated; and M1 is an element from group I of the periodic table; so as to make a compound of the general formula R1_(4-m)MOR3_(in-1)R2.

A modification (Method C) of the aforementioned (Method B), is to react the starting material (R¹ _(4-q) MOR³ _(q)) with a halogen or halogen compound so as to replace one or more of the OR³ groups with a halogen group due to reaction with the halogen or halogen compound. The halogen or halogen compound can be any suitable material such as hydrobromic acid, thionylbromide, hydrochloric acid, chlorine, bromine, thionylchloride or sulfurylchloride and the like. Depending upon the ratio of halogen or halogen compound to starting material (and other parameters such as reaction time and/or temperature), one or more alkoxy groups can be replaced by a halogen group—though in most examples, a single alkoxy group or all alkoxy groups will be replaced. If a single alkoxy group is replaced, then the starting material R¹ _(4-q) MOR³ _(q) becomes R¹ _(4-q) MOR³ _(q-1)X³ where X³ is a halogen from the halogen or halogen compound reacted with the starting material (or simply begin with starting material R¹ _(4-q) MOR³ _(q-1)X³). If all alkoxy groups are replaced due to the reaction with the halogen or halogen compound, then the starting material R¹ _(4-q) MOR³ _(q) becomes R¹ _(4-q) MX³ _(q). Then, as mentioned for Method B above, either starting material R¹ _(4-q) MOR³ _(q-1)X³ or R¹ _(4-q) MX³ _(q) is reacted with a compound R²X¹ where R² is a preferably fluorinated alkyl, aryl, alkenyl or alkynyl group and X¹ is preferably an element from group I of the periodic table, so as to form R¹ _(4-q) R²MOR³ _(q-1), R¹ _(4-q)R²MX³ _(q-1) (or even R¹ _(4-q)R² ₂MX³ _(q-2) depending upon reaction conditions). A reaction with R¹ _(4-q) MOR³ _(q-1)X³ is preferred due to greater ease of control of the reaction.

This Method C can be described as a method comprising reacting a compound of the general formula X3MOR3₃, where X3 is a halogen, M is an element selected from group 14 of the periodic table, and OR3 is alkoxy; with a compound of the general formula R1M1; where R1 is selected from alkyl, alkenyl, aryl and alkynyl and wherein R1 is partially or fully fluorinated; and M1 is an element from group I of the periodic table; so as to form a compound of the general formula R1MOR3₃.

Related Methods B and C can be described as a single method comprising reacting a compound of the general formula R1_(4-m)MOR3_(m-n)X_(n) wherein m is an integer from 2 to 4, and n is an integer from 0 to 2, R1 is selected from alkyl, alkenyl, aryl, or alkyl, alkenyl or aryl, and wherein R1 is nonfluorinated, or fully or partially fluorinated; OR3 is alkoxy, and M is an element selected from group 14 of the periodic table; with a compound of the general formula R2M1, wherein R2 is selected from alkyl, alkenyl, aryl, alkynyl, and wherein R2 is at least partially fluorinated, and M1 is an element from group I of the periodic table; so as to make a compound of the general formula R2MR1_(4-m)OR3_(m-n)X_(n-1).

Of course, as will be seen below, the above starting materials in the method examples set forth above are only examples, as many other starting materials could be used. For example, the starting material could be a halide rather than an alkoxide (e.g. a mono-, di- or trichlorosilanes) or another material having both alkoxy and halogen groups on the group 14 element, along with 0, 1 or even 2 organic groups (alkyl, alkenyl, aryl, alkynyl) also bound to the group 14 element. Though the methods of the invention preferably use starting materials having the group 14 element set forth above, many different combinations of alkoxy groups, halogen groups, and organic groups (alkyl, alkenyl, . . . etc.) can be bound to the group 14 element. And, of course, such starting materials can be commercially available starting materials or can be made from other available starting materials (in which case such materials are intermediate compounds in the methods of the invention).

In addition, the methods of the invention include, it is within the scope of the invention, that a method for forming a final compound could include Methods A, B and/or C above. For example, one organic group, preferably fluorinated, could become bound to the group 14 element M by Method A followed by binding a second organic group, preferably fluorinated, to the group 14 element M by Method B. Or, Method B could be performed first, followed by Method A—or Method C could be performed in combination with Methods A and/or B, etc. And, of course, any particular reaction (binding of an organic group to M) could be performed only once by a particular reaction, or multiple times (binding of multiple organic groups, the same or different from each other) by repeating the same reaction (a, b or c) multiple times. Many combinations of these various reactions and starting materials are possible. Furthermore, any of the methods or method combinations could include any of a number of additional steps including preparation of the starting material, replacing one or more alkoxy groups of the final compound with halogens, purifying the final compound, hydrolysis and condensation of the final compound (as will be described further below), etc.

Example 1 (Making a Compound I via Method B)

CF₂═CF—Cl+sec/tert-BuLi→CF₂=CF—Li+BuCl CF₂═CF—Li+Si(OEt)₄→CF₂═CF—Si(OEt)₃+EtOLi

200 ml of freshly distilled dry Et₂O is added to a 500 ml vessel (under an argon atmosphere). The vessel is cooled down to −80° C. and 15 g (0.129 mol) of CF₂═CFCl gas is bubbled to Et₂O. 100 ml (0.13 mol) of sec-BuLi is added dropwise during three hours. The temperature of the solution is kept below −60° C. all the time. The solution is stirred for 15 minutes and 29 ml (27.08 g, 0.130 mol) of Si(OEt)₄ is added in small portions. The solution is stirred for over night allowing it to warm up to room temperature. Formed red solution is filtered and evaporated to dryness to result crude trifluorovinyltriethoxysilane, CF₂═CFSi(OEt)₃.

Example 2 (Making a Compound I via Method C)

CF₂═CF—Li+ClSi(OEt)₃→CF₂═CF—Si(OEt)₃+LiCl

CF₂═CFSi(OEt)₃ is also formed when 30.80 g (0.155 mol) ClSi(OEt)₃ in Et₂O is slowly added to solution of CF₂═CF—Li (0.155 mol, 13.633 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight allowing it slowly warn to room temperature. LiCl is removed by filtration and solution evaporated to dryness to result yellow liquid, crude trifluorovinyltriethoxysilane.

Example 3 (Making a Compound IV via Method B or C)

Follow steps in Example 1 or 2 above, followed by CF₂═CF—Si(OEt)₃+excess SOCl₂+py.HCl→CF₂═CF—SiCl₃+3 SO₂+3 EtCl

24.4 g (0.100 mol) crude trifluorovinyltriethoxysilane, 44 mL (0.60 mol, 71.4 g) thionylchloride and 1.1 g (0.0045 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and trifluorovinyltrichlorosilane

is purified by distillation.

Example 4 (Making a Compound I via Method A)

C₇F₇Br+Mg+excess Si(OEt)₄→C₇F₇Si(OEt)₃

250 g (0.8418 mol) heptafluorobromotoluene, 22.69 g (0.933 mol) magnesium powder, small amount of iodine (15 crystals) and 750 mL (3.3672 mol, 701.49 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜250 mL). After stirring at room temperature for 16 h diethylether is evaporated. An excess of n-heptane (˜600 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield heptafluorotoluene-triethoxysilane.

Example 5 (Making a Compound IV via Method A)

Follow the steps in Example 4, followed by 2. C₇F₇Si(OEt)₃+6 SOCl₂+py.HCl→C₇F₇SiCl₃ where 114.1 g (0.300 mol) heptafluorotoluenetriethoxysilane, 131 mL (1.800 mol, 214.1 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Excess of SOCl₂ is evaporated and perfluorotoluenetrichlorosilane

isolated by vacuum-distillation.

Example 6 (Making a Compound III via Method A)

Follow same steps as in Example 5, except isolate (by vacuum distillation at the end), perfluorotoluenedichloroethoxysilane, CF₃-C₆F₄-Si(OEt)Cl₂

Example 7 (Making a Compound V from a Compound I or II via Method C)

C₆F₅Si(OEt)₃+SOCl₂+py.HCl →C₆F₅Si(OEt)₂Cl+BtCl   1 C₆F₅Si(OEt)₂Cl+CF₂═CFLi→C₆F₅(CF₂═CF)Si(OEt)₂   2 C₆F₅(CF₂═CF)Si(OEt)₂+excess SOCl₂+py.HCl→C₆F₅(CF₂═CF)SiCI₂   3

152.0 g (0.460 mol) pentafluorophenyltriethoxysilane, 34 mL (0.460 mol, 54.724 g) thionylchloride and 6.910 g (0.0598 mol) pyridinium hydrochloride are refluxed and stirred for 18 h. Pyridinium hydrochloride is precipitated at −78° C. and the solution is filtrated. Pentafluorophenylchlorodiethoxysilane

is isolated by vacuum distillation.

Then 49.712 g (0.155 mol) pentafluorophenylchlorodiethoxysilane, C₆F₅SiCl(OEt)₂, in Et₂O is slowly added to solution of CF₂═CF—Li (0.155 mol, 13.633 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight while it will slowly warm to room temperature. LiCl is removed by filtration and the product, pentafluorophenyltrifluorovinyldiethoxysilane,

purified by distillation.

Example 8 (Making a Compound VII from a Compound I or II via Method C)

Follow the steps above for Example 7, and then

12.1 g (0.0328 mol) pentafluorophenyltrifluorovinyldiethoxysilane, 12 mL (0.1.638 mol, 19.487 g) thionylchloride and 0.50 g (0.0043 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and residue is fractionally distilled under reduced pressure to yield a mixture of 80% pentafluorophenyltrifluorovinyldichlorosilane.

Example 9 (Making a Compound I via Method A)

C₆F₅Br+Mg+2 Ge(OEt)₄→C₆F₅Ge(OEt)₃

61.5 mL (0.4944 mol, 122.095 g) pentafluorobromobenzene, 13.22 g (0.5438 mol) magnesium powder and 250.00 g (0.9888 mol) tetraethoxygermane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜400 mL). After stirring at 35° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜400 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield pentafluorophenyl-triethoxygermane.

Example 10 (Making a Compound IV via Method A)

Follow the steps in Example 9, then:

50 g (0.133 mol) pentafluorophenyltriethoxygernuane, 58 mL (0.80 mol, 95.2 g) thionylchloride and 1.97 g (0.017 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and pentafluorophenyltrichlorogermane isolated by vacuum distillation.

Example 11 (Making a Compound I via Method A)

C₁₀F₇Br+Mg+excess Si(OEt)₄→C₁₀F₇Si(OEt)₃

166.5 g (0.50 mol) 2-bromoperfluoronaphthalene, 13.37 g (0.55 mol) magnesium powder and 448.0 mL (2.00 mol, 416.659 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜200 mL). After stirring at 35° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜400 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield perfluoronaphthalenetriethoxysilane.

Example 12 (Making a Compound IV via Method A)

Follow the steps in Example 11, then

100 g (0.240 mol) perfluoronaphthalenetriethoxysilane, 105.2 mL (1.442 mol, 171.55 g) thionylchloride and 3.54 g (0.0306 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and perfluoronaphthalenetrichlorosilane isolated by vacuum distillation.

Example 13 (Making Compound V via Method A)

C₆F₅Br+Mg+4 MeSi(OMe)₃→C₆F₅(Me)Si(OMe)₂

57.9 mL (0.465 mol, 114.726 g) bromopentafluorobenzene, 12.42 g (0.511 mol) magnesium powder and 265 mL (1.858 mol, 253.128 g) methyltrimethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜320 mL). After stirring at 45° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜300 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue, methyl(pentafluorophenyl)dimethoxysilane, is used without further purification.

Example 14 (Making Compound VII via Method A)

Follow steps in Example 13, then

81.68 g (0.300 mol) methyl(pentafluorophenyl)dimethoxysilane, 109 mL (1.50 mol, 178.4 g) thionylchloride and 3.69 g (0.0319 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Excess of SOCl₂ is evaporated and methyl(pentafluorophenyl)dichlorosilane isolated by vacuum-distillation.

Example 15 (Making a Compound V via Method A)

2 C₆F₅Br+2 Mg+Si(OEt)₄→(C₆F₅)₂Si(OEt)₂

265.2 mL (1.95 mol, 525.353 g) bromopentafluorobenzene, 52.11 g (2.144 mol) magnesium powder and 216 mL (0.975 mol, 203.025 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜240 mL). The solution is stirred for 30 minutes after which additional 90 mL of Et₂O is carefully added. After stirring at 35° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜600 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield di(pentafluorophenyl)diethoxysilane.

Example 16 (Making a Compound V via Method C)

C₆F₅Cl+sec-BuLi→C₆F₅Li+sec-BuCl C₆F₅Li+C₆F₅Si(OEt)₂Cl→(C₆F₅)₂Si(OEt)₂+LiCl

39.52 g (0.195 mol) chloropentafluorobenzene is weighed to a 1000 mL vessel and 250 mL Et₂O is added. The vessel is cooled down to −70° C. and 150 mL (0.195 mol) of sec-BuLi (1.3 M) is added dropwise during one hour. The temperature of the solution is kept below −50° C. all the time. The solution is stirred for 30 minutes and 62.54 g (0.195 mol) of diethoxychloropentafluorophenylsilane in Et₂O (100 mL) is added in small portions. The solution is stirred for over night allowing it to warm up to room temperature. Formed clear solution is filtered and evaporated to dryness to result di(pentafluorophenyl)diethoxysilane, (C₆F₅)₂Si(OEt)₂.

Example 17 (Making a Compound VI via Method A or C)

Follow the steps in Example 15 or Example 16, then: (C₆F₅)₂Si(OEt)₂+SOCl₂+py.HCl→(C₆F₅)₂SiCI₂

180.93 g (0.400 mol) di(pentafluorophenyl)diethoxysilane, 146 mL (2.00 mol, 237.9 g) thionylchloride and 4.92 g (0.0426 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Excess of SOCl₂ is evaporated and di(pentafluorophenyl)dichlorosilane isolated by vacuum-distillation.

Example 18 (Making an “Other Compound” via Method A)

C₆F₅MgBr+HSiCl₃→C₆F₅(H)SiCl₂

600.0 mL (0.300 mol) pentafluorophenyl magnesiumbromide (0.5 M sol. in Et₂O) is added dropwise to a solution of 30.3 mL (0.300 mol, 40.635 g) HSiCl₃ in Et₂O at −70° C. Reaction mixture is allowed to warm slowly to room temperature by stirring overnight. Diethyletier is evaporated and an excess of n-heptane (˜200 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue, pentafluorophenyldichlorosilane, is purified by fractional distillation.

Example 19 (Making a Compound I via Method C)

CH≡Na+ClSi(OEt)₃→CH≡C—Si(OEt)₃+NaCl

79.49 g (0.400 mol) ClSi(OEt)₃ in Et₂O is slowly added to a slurry of CH≡C—Na (0.400 mol, 19.208 g) in Xylene/light mineral oil at −78° C. Reaction mixture is stirred overnight allowing it slowly warm to room temperature. NaCl is removed by filtration and solution evaporated to dryness to result acetylenetriethoxysilane.

Example 20 (Making a Compound VII via Method A)

C₆F₅Br+Mg+CH₂═CH—Si(OEt)₃→C₆F₅(CH₂═CH)Si(OEt)₂   1 C₆F₅(CH₂═CH)Si(OEt)₂+SOCl₂+py.HCl→C₆F₅(CH2═CH)SiCl₂   2

100 mL (0.8021 mol, 198.088 g) pentafluorobromobenzene, 24.90 g (1.024 mol) magnesium powder and 670 mL (3.2084 mol, 610.623 g) vinyltriethoxysilane are mixed together at room temperature and Et₂O is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜400 mL). After stirring at 35° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜500 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield pentafluorophenylvinyldiethoxysilane.

120.275 g (0.3914 mol) pentafluorophenylvinyldiethoxysilane, 143 mL (1.9571 mol, 232.833 g) thionylchloride and 5.880 g (0.0509 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and pentafluorophenylvinyldichlorosilane

isolated by vacuum distillation.

Example 21 (Making a Compound I from Method B)

CH₂═CH—C(═O)—O—Na+ClSi(OEt)₃→CH₂═CH—C(═O)—O—Si(OEt)₃+NaCl

6.123 g (0.0651 mol) sodium acrylate is dissolved to 25 mL THF and cooled to −70° C. 12.8 mL (0.0651 mol, 12.938 g) chlorotriethoxysilane in THF (15 mL) is added dropwise to reaction solution. The solution is stirred for over night allowing it to warm up to room temperature. NaCi is removed by filtration and solution evaporated to dryness to result clear liquid, acryltriethoxysilane.

Example 22 (Making a Compound II)

CF₃—(CF₂)₇—CH₂—CH₂—Si(OEt)3+SOCl₂+py.HCl→CF₃—(CF₂)₇—CH₂—Si(OEt)₂Cl

183.11 g (0.300 mol) 1H,1H 2H,2H-Perfluorodecyltriethoxysilane, 22 mL (0.300 mol, 35.69 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride are refiuxed and stirred for 16 h. Excess of SOCl₂ is evaporated and 1H,1H,2H,2H-Perfiuorodecylchlorodi(ethoxy)silane isolated by vacuum-distillation.

Though this example is not using Methods A, B or C, method C could be used to add a second organic group (replacing the Cl group), or Methods A and B could be used replace an ethoxy group in the starting material with an additional organic group. Also, the starting material could be made by Methods A, B or C (starting earlier with a tetraethoxysilane and reacting as in the other examples herein).

Example 23 (Making a Compound I via Method A)

C₈F₁₇Br+Mg+excess Si(OEt)₄→C₈F₁₇Si(OEt)₃ C₈F₁₇Si(OEt)₃+excess SOCl₂+py.HCl→C₈F₁₇SiCl₃

250 g (0.501 mol) 1-Bromoperfiuorooctane (or 273.5 g, 0.501 mol 1-Jodoperfiuorooctane), 13.3)9 g (0.551 mot) magnesium powder, small amount of iodine (15 crystals) and 363 mL (2.004 mol, 339.00 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exotherrnic reaction is observed (˜200 mL). After stirring at room temperature for 16 h diethylether is evaporated. An excess of n-heptane (˜400 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield perfluorooctyltriethoxysilane.

Example 24 (Making a Compound IV via Method A)

Follow the steps in Example 23, then

174.7 g (0.300 mol) perfluorooctyltriethoxysilane, 131 mL (1.800 mol, 214.1 g) thionylchioride and 4.51 g (0.039 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Excess of SOCl₂ is evaporated and perfluorooctyltrichlorosilane isolated by vacuum-distillation.

Example 25 (Making a Compound I via Method A)

CF₂═CF—O—CF₂—CF₂—Br+Mg+excess Si(OEt)₄→CF₂═CF—O—CF₂—CF₂—Si(OEt)₃

138.47 g (0.500 mol) 2-Bromotetrafluoroethyl trifluorovinyl ether, 13.37 g (0.550 mol) magnesium powder, small amount of iodine (10 crystals) and 362 mL (2.000 mol, 338.33 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜200 mL). After stirring at room temperature for 16 h diethylether is evaporated. An excess of nrheptane (˜400 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield tetrafluoroethyl trifluorovinyl ether triethoxysilane.

Example 26 (Making a Compound IV via Method A)

Follow steps in Example 25, followed by

108.1 g (0.300 mol) tetrafluoroethyl trifluorovinyl ether triethoxysilane, 131 mL (1.800 mol, 214.1 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Excess of SOCl₂ is evaporated and tetrafluoroethyl trifluorovinyl ether trichlorosilane is isolated by vacuum-distillation.

Example 27 (Making a Compound I via Method B)

CF≡C—Li+ClSi(OEt)₃→CF≡C—Si(OEt)₃+LiCl

30.80 g (0.155 mol) ClSi(OEt)₃ in Et₂O is slowly added to solution of CF≡C—Li (0.155 mol, 7.744 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight allowing it slowly warm to room temperature. LiCl is removed by filtration and solution evaporated to dryness to result fluoroacetylenetriethoxysilane.

Example 28 (Making a Compound V11I via Method C)

(C₆F₅)₂Si(OEt)₂+SOCl₂→(C₆F₅)₂Si(OEt)Cl+EtCl+SO₂ C₆F₅Li+(C₆F₅)₂Si(OEt)Cl→(C₆F₅)₃SiOEt+LiCl (C₆F₅)₃SiOEt+SOCl₂→(C₆F₅)₃SiCl+EtCl+SO₂

180.93 g (0.400 mol) di(pentafluorophenyl)diethoxysilane, 29 mL (0.400 mol, 47.6 g) thionylchloride and 4.92 g (0.0426 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Unreacted SOCl₂ is evaporated and di(pentafluorophenyl)chloroethoxysilane isolated by vacuum distillation.

88.54 g (0.200 mol) of di(pentafluorophenyl)chloroethoxysilane in Et₂O is slowly added to solution of C₆F₅—Li (0.200 mol, 34.80 g, prepared in situ) in Et₂O at −78° C. The solution is stirred for over night allowing it to warm up to room temperature. Formed clear solution is filtered and evaporated to dryness to result tri(pentafluorophenyl)ethoxysilane, (C₆F₅)₃SiOEt.

Example 29 (Making a Compound IX via Method C)

Follow steps in Example 28, followed by

114.86 g (0.200 mol) tri(pentafluorophenyl)ethoxysilane, 14.6 mL (0.200 mol, 23.8 g) thionylchloride and 2.46 g (0.0213 mol) pyridinium hydrochloride are refluxed and stirred for 16 h. Unreacted SOCl₂ is evaporated and tritpentafluorophenyl)chlorosilane isolated by vacuum-distillation.

In addition to altering the organic groups in the above examples, it is of course also possible to use other reagents in the methods above. For example, in place of diethyl ether, other solvents such as THF could be used. In place of n-heptane (in Method A) other non polar solvents such as n-hexane could be used. And in place of thionyl chloride (for replacing one or more alkoxy groups with a halogen), chlorine, hydrochloric acid, hydrobromic acid, thionylbromide, chlorine or sulfurylchloride could be used. Also, the temperatures and times (and other process parameters) can be varied as desired. In one embodiment, it is preferred that the molar ratio of the starting material to R²X¹ (Methods B or C) is 0.5:1 to 2:1—preferably 1:1. Also, the starting material and R²X¹ are preferably mixed at a temperature less than −40° C. degrees, e.g. between −50° C. and −100° C. and warmed to a higher temperature over a period of four hours or more (this higher temperature can be room temperature or higher if desired)—or over a longer period of time such as overnight.

As can be seen from the examples above, Methods B and C of the invention involve reacting a first compound (having an M group selected from group 14 of the periodic table, 0, 1 or 2 organic groups bound to M) with a second compound (having an element from group 1 of the periodic table and a “new” organic group). As can also be seen from the above, such a reaction can take place if the first compound has alkoxy groups bound to M or both alkoxy and halogen groups (0, 1 or 2 halogen groups) bound to M. Method C, as mentioned earlier, is a variation of Method B—and both methods can be viewed as comprising: reacting a compound of the general formula R¹ _(4-m)MOR³ _(m-n)X_(n), where R¹ is any nonfluorinated (including deuterated) or partially or fully fluorinated organic group (preferably a partially or fully fluorinated aryl, alkenyl, alkynyl or alkyl group) as set forth above, where M is selected from group 14 of the periodic table, where X is a halogen, where OR³ is an alkoxy group, where m=2 to 4 and n=0 to 2. R¹ _(4-m)MOR³ _(m-n)X_(n) is reacted with R²X¹ where R² is selected from alkyl, alkenyl, aryl or alkynyl (and where R2 is fluorinated (fully or partially), and where X¹ is an element from group 1 of the periodic table. X¹ is preferably Na, Li or K, more preferably Na or Li, and most preferably Li. M is preferably Si, Ge or Sn, more preferably Si or Ge, and most preferably Si. X is preferably Cl, Br or I, more preferably Cl or Br, and most preferably Cl. OR³ is preferably an alkoxy group having from 1 to 4 carbon atoms, more preferably from 1 to 3 carbons, and most preferably 2 carbons (ethoxy). Also, “m” is preferably 3 or 4, whereas “n” is preferably 0 or 1.

R¹ and R² are independently preferably partially or fully-fluorinated (though not necessarily as can be seen in prior examples) organic groups such as an aryl group (by aryl group we mean any organic group having a ring structure) though preferably a five or six carbon ring that is unsubstituted or substituted. For a six carbon ring structure, 1, 2 or 3 substituents can be bound to the ring, which substituents can be actively bound to the ring via a variation on the Method C set forth above (to be described further below). The substituents can be alkyl groups of any desired length, straight or branched chain, preferably fluorinated, and preferably having from 1 to 4 carbon atoms. Or the substituents on the ring structure can comprise a C═C double bond and be an alkenyl group (by alkenyl group we mean any organic group with a C═C double bond) such as an acrylate, vinyl or allyl group. A fluorinated vinyl, methyl or ethyl group on a fluorinated phenyl group are examples. Or, the aryl group could be a multi ring structure (e.g. perfluoronaphthalene or a biphenyl group). Or R¹ and R² could independently be an alkenyl group such as a vinyl or longer chain group having a C═C double bond, or a group having other types of double bonds (e.g C═O double bonds or both C═C and C═O double bonds) such as acrylate and methacrylate groups. R¹ and R² could also be an alkynyl group (by alkynyl group we mean any organic group with a carbon-carbon triple bond) as mentioned previously, as well as an alkyl group. If an alkyl group (by alkyl group we mean a carbon chain of any length), preferably the carbon chain is from 1 to 14, and more preferably from 4 to 8. Perfluorinated alkyl groups from 1 to 8 carbons can be used, as well as fluorinated (e.g. partially fluorinated) groups longer than 8 carbons. All the organic groups above could be deuterated in stead of fluorinated (or partially deuterated and partially fluorinated), though fully or partially fluorinated (particularly fully fluorinated) is preferred.

In Method C set forth above, an organic (or hybrid) group “R” (e.g. R2) becomes bound to a group 3-6 or 13-16 element “M” by replacing a halogen “X” bound to “M” via the specified reaction. In an alternative to this method (Method D), an organic (or hybrid) group “R” (e.g. R1) comprises the halogen “X”—preferably Cl or Br (rather than “X” being bound to “M”). Thus when the reaction is performed, R2 replaces X bound to R1, such that R2 becomes bound to R1 (which is in turn bound to M). Preferably the other groups bound to M are alkoxy groups (OR3) or other organic groups. More particularly, such a method comprises providing a compound X_(a)R¹MOR³ ₂R⁴ where a is from 1 to 3, X is a halogen(s) bound to R¹, R1 is an organic group (preferably an aryl, alkyl, alkenyl or alkynyl—more preferably an alkyl or aryl group), OR³ is an alkoxy, and R⁴ is either an additional alkoxy group or an additional organic group (selected from aryl, alkyl, alkenyl or alkynyl), and reacting this compound with R²M¹ where M¹ is selected from group 1 of the periodic table and R² is an organic group preferably selected from aryl, alkyl, alkenyl and alkynyl, etc., so as to form R² _(a)R¹MOR³ ₂R⁴.

In one embodiment, R⁴ is an alkoxy group the same as OR³, such that the method comprises reacting X_(a)R¹MOR³ ₃ with R²M¹ to form R² _(a)R¹MOR³ ₃ (where R¹ and OR³ are bound to M and R² is bound to R¹. In another embodiment, R⁴ is an organic group selected from aryl, alkyl, alkenyl and alkynyl. Preferably OR³ is a methoxy, ethoxy or propoxy, R¹ is an aryl or alkyl (straight or branched chain) having from 1 to 14 carbons, and R² is an aryl, alkyl, alkenyl or alkynyl, where a=1 or 2 if R¹ is an alkyl and a=1, 2 or 3 if R¹ is an aryl group. R² can be an epoxy, acrylate, methacrylate, vinyl, allyl or other group capable of cross linking when exposed to an electron beam or in the presence of a photoinitiator and electromagnetic energy (e.g. UV light).

Example A (Forming a Compound I or IV via Method D)

1,4-Br₂C₆F₄+Mg+Si(OEt)₄→Br(C₆F₄)Si(OEt)₃   1 Br(C₆F₄)Si(OEt)₃+CF₂═CFLi→(CF₂═CF)(C₆F₄)Si(OEt)₃   2

250 g (0.812 mol) 1,4-dibromotetrafluorobenzene, 21.709 g (0.8932 mol) magnesium powder, small amount of iodine (15 crystals) and 181 mL (0.812 mol, 169.164 g) tetraethoxysilane were mixed together at room temperature and diethylether was added dropwise to the vigorously stirred solution until an exothermic reaction was observed (˜250 mL). After stirring at room temperature for 16 h diethylether was evaporated. An excess of n-heptane (˜600 mL) was added to precipitate the magnesium salts. Solution was filtrated and evaporated to dryness. The residue was fractionally distilled under reduced pressure to yield 4-bromotetrafluorophenyltriethoxysilane.

78.246 g (0.200 mol) 4-bromotetrafluorophenyltriethoxysilane in Et₂O is slowly added to solution of CF₂═CF—Li (0.200 mol, 17.592 g, prepared in situ) in Et₂O at 78° C. Reaction mixture is stirred overnight while it will slowly warm to room temperature. LiBr is removed by filtration and the product, 4-triethoxysilyl-perfluorostyrene, purified by distillation.

117.704 g (0.300 mol) 4-triethoxysilylperfluorostyrene, 131 mL (1.800 mol, 214:1 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride were refluxed and stirred for 16 h. Excess of SOCl₂ was evaporated and 4-trichlorosilyl-perfluorostyrene isolated by vacuum-distillation.

The above example could be modified where 2 or 3 halogens (in this case Br) are bound to the phenyl group so as to result in multiple vinyl substituents. Also, the phenyl group could be another organic group such as an straight or branched chain alkyl group, a multi ring aryl group, etc., whereas the vinyl group could be any suitable organic group capable of binding to a group I element (in the above example Li) and replacing the halogen (in the above example Br). Examples other than vinyl include methyl, ethyl, propyl, phenyl, epoxy and acrylate.

Example B (Forming a Compound I via Method D)

CF₂Cl—C(═O)—ONa+ClSi(OEt)₃→CF₂Cl—C(═O)—O—Si(OEt)₃+NaCl CF₂═CF—Li+CF₂Cl—C(═O)—O—Si(OEt)₃→CF₂═CF—CF₂—C(═O)—O—Si(OEt)₃+LiCl

15.246 g (0.10 mol) sodium chlorodifluoroacetate, is dissolved to 100 mL Et₂O and cooled to −70° C. 19.7 mL (0.10 mol, 19.872 g) chlorotriethoxysilane in Et₂O (50 mL) was added dropwise to reaction solution. The solution was stirred for over night allowing it to warm up to room temperature. NaCl is removed by filtration and solution evaporated to dryness to result clear colourless liquid, chlorodifluoroacetic acid, triethoxysilyl ester.

29.27 g (0.10 mol) chlorodifluoroacetic acid, triethoxysilyl ester, is dissolved to 100 mL Et₂O and slowly added to solution of CF₂═CF—Li (0.10 mol, 8.796 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight allowing it slowly warm to room temperature. LiCl is removed by filtration and solution evaporated to dryness to result yellow liquid, crude perfluoro-3-butene acid, triethoxysilyl ester.

Example C (Forming a Compound I or IV via Method D)

Br(C₆F₄)Si(OEt)₃+C₆F₅—Li→C₆F₅—C₆F₄—Si(OEt)₃+LiBr

78.246 g (0.200 mol) 4-bromotetrafluorophenyltriethoxysilane in Et₂O is slowly added to solution of C₆F₅—Li (0.200 mol, 34.80 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight while it will slowly warm to room temperature. LiBr is removed by filtration and the product, perfluorobiphenyltriethoxysilane, purified by distillation.

143.516 g (0.300 mol) perfluorobiphenyltriethoxysilane, 131 mL (1.800 mol, 214.1 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride were refluxed and stirred for 16 h. Excess of SOCl₂ was evaporated and perfluorobiphenyltrichlorosilane isolated by vacuum-distillation.

Example D (Forming a Compound I or IV via Method D)

CF₂═CF—(CF₂)₄—Si(OEt)₃+excess SOCl₂→CF₂═CF—(CF₂)₄—SiCI₃

143.94 g (0.40 mol) 1,4-dibromooctafluorobutane, 10.69 g (0.44 mol) magnesium powder, small amount of iodine (15 crystals) and 88 mL (0.40 mol, 82.42 g) tetraethoxysilane were mixed together at room temperature and diethylether was added dropwise to the vigorously stirred solution until an exothermic reaction was observed (˜200 mL). After stirring at room temperature for 16 h diethylether was evaporated. An excess of n-heptane (˜400 mL) was added to precipitate the magnesium salts. Solution was filtrated and evaporated to dryness. The residue was fractionally distilled under reduced pressure to yield 4-bromooctafluorobutanetriethoxysilane.

88.641 g (0.200 mol) 4-bromooctafluorobutanetriethoxysilane in Et₂O is slowly added to solution of CF₂═CF—Li (0.200 mol, 17.592 g, prepared in situ) in Et₂O at 78° C. Reaction mixture is stirred overnight while it will slowly warm to room temperature. LiBr is removed by filtration and the product, perfluoro-1-hexenetriethoxysilane, purified by distillation.

133.295 g (0.300 mol) perfluoro-1-hexenetriethoxysilane, 131 mL (1.800 mol, 214.1 g) thionylchloride and 4.51 g (0.039 mol) pyridinium hydrochloride were refluxed and stirred for 16 h. Excess of SOCl₂ was evaporated and perfluoro-l-hexenetrichlorosilane isolated by vacuum-distillation.

In the above “Method D” examples, R¹, R², R³ and R⁴ are preferably partially or fully fluorinated. Hydrolysis and Condensation of the Compound(s):

Compounds IV, VII and IX have organic (or hybrid) R group(s) and halogen(s) (preferably Br or Cl) bound to M (selected from groups 3-6 or 13-16—preferably group 14)). These compounds can be hydrolyzed alone or in any combination to result in a material having a -M-O-M-O- backbone with R groups bound to the backbone, and that preferably has a molecular weight of from 500 to 10,000 (more preferably from 1000 to 5000). In one embodiment, a compound selected from Compound IV is hydrolyzed with another compound selected from Compound IV. In another embodiment, a single compound from Compound VII is hydrolyzed. Many other combinations are possible, including: a) Compound IV+Compound VII; b) Compound IV+Compound IV+Compound IV; c) Compound VII+Compound VII; d) Compound IV+Compound VII+Compound IX; e) Compound IV+Compound IV+Compound IX; :f) Compound VII+Compound IX, etc. Any other combinations, in any desired ratio, can be used for the hydrolysis and eventual deposition.

Hydrolysis Example 1—Compound IV+Compound IV

If one of the compounds to be hydrolyzed and condensed is pentafluorophenyltrichlorosilalne, this can be prepared as in the methods set forth above; by: C₆F₅Br+Mg+excess Si(OEt)₄→C₆F₅Si(OEt)₃+(C₆F₅)₂Si(OEt)₂ C₆F₅Si(OEt)₃+SOCl₂+py.HCl→C₆F₅SiCl₃

100 mL (0.8021 mol, 198.088 g) pentafluorobromobenzene, 24.90 g (1.024 mol) magnesium powder and 716 mL (3.2084 mol, 668.403 g) tetraethoxysilane are mixed together at room temperature and diethylether is added dropwise to the vigorously stirred solution until an exothermic reaction is observed (˜200 mL). After stirring at 35° C. for 16 h the mixture is cooled to room temperature and diethylether evaporated. An excess of n-heptane (˜500 mL) is added to precipitate the magnesium salts. Solution is filtrated and evaporated to dryness. The residue is fractionally distilled under reduced pressure to yield pentafluorophenyltriethoxysilane.

100 mL (0.375 mol, 124.0 g) pentafluorophenyltriethoxysilane, 167 mL (2.29 mol, 272.0 g) thionylchloride and 5.63 g (0.0487 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and pentafluorophenyltrichlorosilane

isolated by vacuum-distillation. If a second of the compounds to be hydrolyzed and condensed is trifluorovinyltrichlorosilane, this can be prepared by:

119 mL (0.155 mol) sec-butyllithium (1.3 M solution in cyclohexane) is added under argon with stirring to 18.053 g (0.155 mol) chlorotrifluoroethylene

dissolved in Et₂O at −80° C. After the addition is complete the reaction mixture is stirred for 15 min to yield lithiumtrifluoroethylene.

30.80 g (0.155 mol) ClSi(OEt)₃ in Et₂O is slowly added to solution of CF₂═CF—Li (0.155 mol, 13.633 g, prepared in situ) in Et₂O at −78° C. Reaction mixture is stirred overnight while it will slowly warm to room temperature. LiCl is removed by filtration and the product, trifluorovinyltriethoxysilane,

is isolated by distillation.

24.4 g (0.100 mol) trifluorovinyltriethoxysilane, 44 mL (0.60 mol, 71.4 g) thionylchloride and 0.497 g (0.0045 mol) pyridinium hydrochloride are refluxed and stirred for 24 h. Excess of SOCl₂ is evaporated and trifluorovinyltrichlorosilane

is purified by distillation.

Then, to a solution of trifluorovinyltrichlorosilane and pentafluorophenyltrichlorosilane at a molar ratio 1:1 in dehydrated tetrahydrofuran, is added dropwise a stoichiometric amount of water (e.g. H2O or D20) in THF at 0° C. (nonstoichiometric amounts, higher or lower, can also be used). After stirring for 1 hour, the solution is neutralized with 3 equivalents of sodium hydrogencarbonate. After confirming the completion of generation of carbonic acid gas from the reaction solution, the solution is filtered and volatile compounds are removed by vacuum evaporation to obtain colorless, transparent viscous liquid, poly(pentafluorophenyltrifluorovinyl-siloxane), in a three dimensional network of alternating silicon and oxygen atoms.

The above is but one example of a method comprising: reacting a compound of the general formula R1MX3₃ with a compound of the general formula R2MX3₃ where R1 is selected from alkyl, alkenyl, aryl and alkynyl, R2 is selected from alkenyl, aryl or alkynyl, M is an element selected from groups 3-6 or 13-16 though preferably from group 14 of the periodic table, and X3 is a halogen; with H2O or D20; so as to form a compound having a molecular weight of from 500 to 10,000 with a -M-O-M-O- backbone with R1 and R2 substituents on each M.

In the hydrolysis example above, silicon atoms of the network are modified by pentafluorophenyl and trifluorovinyl groups in an approximate ratio 1:1. Of course other ratios are possible depending upon the ratio of starting materials, and, of course, other three dimensional networks can be achieved by having other (or additional) starting materials selected from Compound IV, VII and IX, along with other hydrolyzable materials. An alternate example is a method comprising: reacting a compound of the general formula R1R2MX3₂ where R1 is selected from alkyl, alkenyl, aryl and alkynyl, R2 is selected from alkenyl, aryl or alkynyl, M is an element selected from group 14 of the periodic table, and X3 is a halogen; with D2O; so as to form a compound having a molecular weight of from 500 to 10,000 with a -M-O-M-O- backbone with R1 and R2 substituents on each M.

Also, though “M” in the above hydrolysis example is silicon, it is possible to have materials with other M groups, or “dope” one or more silanes to be hydrolyzed with a lesser amount of a compound having a different M group such as germanium (or boron, aluminum, selenium, etc.).

Desposition of the Hydrolyzed and Condensed Material

The material formed as above preferably has a molecular weight between 500 and 10,000, more preferably between 1000 and 5000. Other molecular weights are possible within the scope of the invention, however a weight between 1000 and 5000 provides the best properties for depositing the material on a substrate. The substrate can be any suitable substrate, such as any article of manufacture that could benefit from a hydrophobic and/or transparent layer or coating. In the fields of electronics and optical communications, the material could be deposited as a final passivation layer, as a glob top coating, as an underfill in a flip chip process, as a hermetic packaging layer, etc. Because the material can be patterned as will be discussed further below, the material could be deposited on a substrate (e.g. a glass, quartz, silicon or other wafer) as a buffer/cladding, waveguide/core or other layer within a waveguide or other optoelectronic/photonic device.

In general, the siloxane oligomer having the molecular weight as set forth above is mixed with a suitable solvent and deposited. If the material is to be patterned by exposure to electromagnetic radiation (e.g. UV light) then a photoinitiator can be mixed into the material along with the solvent. There are many suitable types of photoinitiators that could be used, such as Irgacure 184, Irgacure 500, Irgacure 784, Irgacure 819, Irgacure 1300, Irgacure 1800, Darocure 1173 or Darocure 4265. The initiator could be highly fluorinated, such as 1,4-bis(pentafluorobenzoyl)benzene or Rhodosil 2074 photoinitiator. Also, thermal initiators can be applied for thermal crosslinking of organic carbon double bond moieties, such as with Benzoyl peroxide, 2,2′-Azobisisobutyronitrile, or tert-Butyl hydroperoxide.

Deposition Example 1: Add 10 w-% of methyl isobutyl ketone and 2 w-% of Irgacure 819 photoinitiator to result in the formation of a spin-coatable and photo-sensitive material. The material is deposited by spin coating, spray coating, dip coating, etc. onto a substrate or other article of manufacture. As mentioned herein, many other organic groups can be used in place of the above groups, though preferably one of the groups in one of the compounds is capable of cross linking when exposed to electromagnetic energy (or an electron beam)—e.g. an organic group with a ring structure (e.g. an epoxy) or a double bond (e.g. vinyl, allyl, acrylate, etc.).

Forming a Waveguide

One use of the material set forth above is as a layer within a waveguide. Though the waveguide could be a fiber optic waveguide (with substantially circular cross section) the example below is in relation to a planar waveguide. On a substrate (PCB, IC, silicon, glass or quartz wafer, etc.) is deposited a lower cladding layer. (A buffer layer can first be deposited if desired.) The cladding layer is made by forming Compounds IV, VII and/or IX and hydrolyzing such compound(s), followed by mixing the hydrolyzed material with a solvent and thermal initiator and then depositing onto the substrate. After deposition, the cladding layer can be fully or partially baked (or exposed to TV light if a photoinitiator is used in place of the thermal initiator) to solidify the cladding. On the cladding layer is deposited a core layer that is made and deposited as above, except with a different ratio of compounds or different compounds that are hydrolyzed/condensed to form the material ready for deposition. By modifying the hydrolysable compounds and/or ratios of compounds in the core layer vs. those in the cladding layer, a different index of refraction is achieved. A developer (e.g. e.g. methanol, ethanol, propanol, acetone, methyl isobutyl ketone, tetrahydrofuran, Dow Chemical DS2100, Dow Chemical DS3000, etc.) is then applied to remove unexposed material. In this way, a core for the waveguide is formed. Then an upper cladding layer is made and deposited in the same way as the lower cladding layer. Though in this example the mask is a binary mask (the material is either fully exposed or not exposed to electromagnetic radiation), it is also possible to provide partial exposure (e.g. in a continuum from full exposure to a low or non-exposure level as in a gray scale mask). Such a gray scale exposure can form a vertical taper in the waveguide when the developer is applied.

This invention has been described in connection with the preferred embodiments. Many-variations of the above embodiments are contemplated as being within the scope of the invention. 

1. A compound of the general formula R¹MR⁴R⁵R⁶ where R¹ is an aryl, alkyl, alkenyl, epoxy or alkynyl group, and where R¹ is fully or partially fluorinated, wherein M is selected from group 14 of the periodic table, wherein R⁴, R⁵ and R⁶ are independently an alkoxy group, OR³, or a halogen group X, except, a) where R⁴, R⁵ and R⁶ are each ethoxy, M is Si and R¹ is perfluorinated phenyl or perfluorinated vinyl; b) where R⁴ is ethoxy, R⁵ and R⁶ are chlorine, M is Si, and R¹ is perfluorinated phenyl; or c) where R⁴, R⁵ and R⁶ are chlorine, M is Si, and R¹ is perfluorinated phenyl, perfluorinated methyl or perfluorinated vinyl.
 2. The compound of claim 1, wherein X is Br or Cl.
 3. The compound of claim 1, wherein RI is fully fluorinated.
 4. The compound of claim 3, wherein RI is an alkenyl or alkynyl group.
 5. The compound of claim 1, wherein RI is an alkyl group having from 1 to 14 carbons, vinyl or allyl group.
 6. The compound of claim 1, wherein R1 is an alkenyl group.
 7. The compound of claim 1, wherein R1 is a fully fluorinated alkenyl group.
 8. The compound of claim 1, wherein R1 is an aryl group having one or more rings, or an alkyl group having from 1 to 14 carbons.
 9. The compound of claim 1, wherein R1 is an alkynyl group.
 10. The compound of claim 1, wherein R4 is a halogen X and R5 and R6 are independently alkoxy groups.
 11. The compound of claim 1, wherein R4 is an alkoxy group and R5 and R6 are independently halogen groups.
 12. The compound of claim 1, wherein R1 is a fully or partially fluorinated phenyl group substituted with fully or partially fluorinated methyl, vinyl or ethyl groups.
 13. The compound of claim 1, wherein OR3 is Cl—C4 alkoxy.
 14. The compound of claim 1, wherein M is Si, Ge, Al or Sn.
 15. The compound of claim 1, wherein X is Cl.
 16. The compound of claim 1, wherein X is Br.
 17. The compound of claim 1, wherein R4, R5 and R6 are each a halogen X.
 18. The compound of claim 1, wherein R4, R5 and R6 are each an alkoxy group OR3.
 19. The compound of claim 1, wherein R1 is a C2+ straight chain or C3+ branched chain.
 20. The compound of claim 1, wherein R1 is a perfluorinated organic group having an unsaturated double bond.
 21. The compound of claim 1, wherein R1 is an epoxy group.
 22. The compound of claim 1, wherein R1 an acrylate group.
 23. The compound of claim 22, wherein M is Si or Ge.
 24. The compound of claim 1, wherein R1 is vinyl.
 25. The compound of claim 24, wherein R1 is fully fluorinated vinyl.
 26. The compound of claim 1, wherein R4, R5 and R6 are each methoxy or propoxy, M is Si and R1 is perfiuorinated phenyl or perfluorinated vinyl.
 27. The compound of claim 1, wherein R4 is methoxy or propoxy, R5 and R6 are Cl, M is Si, and R1 is perfluorinated phenyl.
 28. The compound of claim 1, wherein R4, R5 and R6 are Cl, M is Si, and R1 is perfluorinated substituted phenyl, or perfluorinated alkyl having from 2 to 8 carbons.
 29. The compound of claim 28, wherein R1 is perfluorinated ethyl or propyl.
 30. The compound of claim 1, wherein OR3 is methoxy or ethoxy.
 31. The compound of claim 1, wherein OR3 is ethoxy.
 32. The compound of claim 1, wherein R1 is a fully or partially fluorinated single ring or polycyclic aromatic substituent.
 33. The compound of claim 32, wherein either R1 has one or two rings.
 34. The compound of claim 1, wherein M is Si.
 35. The compound of claim 1, wherein R1 is methyl.
 36. The compound of claim 1, wherein R1 is ethyl.
 37. The compound of claim 1, wherein R1 is propyl.
 38. A method for making the compound R¹ MR⁴R⁵R⁶ of claim 1, comprising: providing a compound MOR3_(q)X_(4-q) where M is an element selected from group 14 of the periodic table, OR3 is an alkoxy group, X is a halogen and q is 3 or 4; reacting the compound MOR3_(q)X_(4-q) with either a) Mg and R1X2 where X2 is Cl, Br or I and R1 is an alkyl, allcenyl, aryl or alkynyl group, and q=4, or b) with R1M1 where R1 is an alkyl, alkenyl, aryl or alkynyl group and wherein R1 is fully or partially fluorinated and M1 is an element from group 1 of the periodic table, and q=3 or 4; so as to form R1MOR3₃, and wherein if R4, R5 or R6 is a halogen, further reacting R1MOR3₃ with a halogen or halogen compound so as to form R¹MR⁴R⁵R⁶.
 39. A method for using the compound of claim 1, comprising: providing the compound of claim 1; hydrolyzing the compound of claim 1 in the presence of H2O or D2O with another compound having the formula R²MR⁴R⁵R⁶; so as to form a compound with an -M-O-M-O- backbone with at least R1 and R2 groups bound thereto and having a molecular weight of from 500 to 10,000.
 40. The method of claim 39, wherein the compound has a molecular weight of from 1500 to
 5000. 